Differentially colored fabric and method of making the same



Patented Aug. 9, 1932 UNITED STATES PATENT FFiE,

GEORGE BIVAT, OF PATTERSON, NEW JERSEY, ASSIGNOB'TO CELANESE CORPORATION GE 7 mama, A ooaronarrou or nnnawaan nrrrnanm'mnnx concern memo AND extreme or MAKING run 80 Drawing.

This invention relates to the production of diflerentially colored fabrics by. treating I material containing an aniline black base is fabrics with an aniline black base after the application of a resist printing paste.

An object, of my invention is to produce prints having dark or black backgrounds and lighter colored designs onfabrics containing organic derivatives of cellulose and par-.

ticularly cellulose acetate. Another object of my invention is to employ a resist printing paste containing vat dyestuffs incon applied thereto, after subsequent steaming or other oxidizing process, lighter colored desi s on black or dark backgrounds may be pro uced.

In accordance with my invention I produce lighter colored designs on dark or black backgrounds by the resist printing of fabric containing organic derivatives of cellulose with a paste containing an oxalate and an alkali and preferably a swelling agent forthe organic derivative of cellulose, which paste may or may not contain a vat dyestnfi'.

, After local application of the resist printing paste, the fabric is padded with a material containing aniline black base and is then steamed to develop the color of the aniline black and also of the vat" dyestufi' ,if it is employed.

The fabric to be treated in accordance with my invention may contain yarns made of any organic derivative of cellulose such as or- .ganic esters of cellulose or cellulose ethers. Examples oforganic esters of cellulose are cellulose acetate, cellulose formats, cellulose Application filed September 20, 1929. Serialli'o. 394,138.

propionate and cellulose butyrate, while examples of cellulose ethers are ethyl cellulose, methyl celluloseand benzl cellulose. The fabric need not necessarily consist Wholly of yarns made of these organic derivatives of cellulose, but may also contain yarns of other fibres such as cotton, silk or reconstituted cellulose.

The paste to be used for the resist printing,

as stated before, contains a suitable alkali glycerin and/or ethyl alcohol, but if the fabric is to be steamed before the application of the aniline black base, I prefer to use as swelling agent glycol derivatives that are less hydroscopic and better solvents for vat dyes, such as thiodigiycol sold under the trade name of Glyezine A (general dyestud) in order to avoid the running of the paste during the steaming.

' Where white designs against dark background are desired, the resist paste will not contain any dyestufi'. However, if colored designs are desired, the resist paste will contain a suitable vat dyestufi. Examples of such vat dyestuffs are the algol colors, such as Algol red GGN Color Index 1129) or the indigosol colors such as Color Index Nos.

1178, .184 and 1217. These vat dyestufis are employed in the paste in suitably reduced condition. p

The resist paste may be locally applied to the fabric in any suitable manner, such as by printing with engraved or embossed rolls, or by brushing or spraying through stencils.

If the resist paste contains no color, or if it contains a dyestufi of the indigosol type, it is not necessary to steam the fabric before padding with the aniline black. Hdwever, if the algol dyestufi' range is used .in the resist printing, the fabric is preferably steamed for 5 minutes after the application of the resist paste, if it is desired to obtain very deep shades.

' After application of the resist printing paste, the fabric is padded with a paste containing aniline black base. This paste contains aniline in the form of its salt such as aniline hydrochloride or aniline sulphate rather than in the form of aniline oil. The paste contains an acid such as acetic acid, an oxidizing agent such as thechlorate of sodium or potassium, and a catalytic decomposi tion agent of the oxidizing salt, such as copper chloride.

After the padding of the aniline black base on the fabric, the fabric is subjected to steam under pressure for say about 5 minutes in a suitable ager such asthe Mather Platt ager. This steaming causes oxidationof the aniline black base in those places where the resist has not been applied. However, the alkali and the metallic oxalate in the resist paste revent the oxidation of the aniline black Ease where the resist paste has been applied. There is thus produced a discharge or printing effect of white or lighter colored design on a black or dark background. This steaming also develops the vatcolor, where it is employed, present in the resist paste.

In order further to illustrate my invention, specific details will be given in the following example. I a

A fabric consisting wholly of cellulose acetate yarn is printed with any of the following pastes.

For a color resist employing an algol dye, the following may be used.

Parts Sodium oxalate 5. 5 Water 12. Tragacanth paste; 31 Caustic soda solution 50% 'concentra tion 15 to 16 Glyezine A 4.1 Algol paste reduced 31 The algol paste reduced is made up as follows: 1

. Parts Algol red GGN paste 16% concentration 300 Sodium hydrosulphite 250 Potassium carbonate 125 British gum 325 This mixture is heated at 50 C. The color resist paste is allowed to stand 24. hours after preparation before it is used.

Example 0 The following is an example of a. color resist employing an indigosol color.

This paste is permitted to stand at least 24 hours after preparation before using.

If the fabric is printed with the white resist paste or the paste containing the indi- I gosol colors, it is not necessary to steam before padding with the aniline black. If the algol dyestuif range is used in the printing paste, the fabric is steamed for 5 minutes before padding with the aniline black in order to obtain deep shades.

The fabric, after any of the above resist I pastes have been applied thereto, is padded with an aniline black base paste, which is made by mixing equal parts of the two fol lowing solutions.

Solution. A

' Parts Aniline hydrochloride 12.7 Glacial acetic acid": 2. 5 Water 13 Alcohol r v 10 Tragacanthpaste 32 Solution B Parts Sodium chlorate 8 Water"- 21 Copper chloride 0. 3

After'padding, the goods are steamed in an ager with steam under pressure for 5 minutes.

If the goods have been printed with a resist containing the algol colors, they are washed in lukewarm water and chromated for 5 minutes at 60 to 70 C. after which they are washed and soaped at 50 to 60 C. i

If the goods have been printed with indigosol colors, the goods are washed at lukewarm temperatures with an a ueous solution containing 3 to 5 grams ofsu furic acid per litre for 10 minutes, after which they are given a chromate" treatment for hour at 50 to 60 C., then washed and scoured. The chromate treatment develops the colors of both the aniline black and of the vat dyestufi's.

It is to be understood that the foregoing detailed description is given merely by way of illustration and that many variations may be made therein without departing from the spirit of my invention.

Having .describedmy invention, what I claim and desire to secure by Letters Pat- 5 out is:

I 1. Method of'producing difi'erential color efi'ects comprising locally applying to a fabric containing an organic derivative of cellulose a material containing a swelling agent for the derivative of cellulose, an alkali and a metallic oxalate, applying a paste containing an aniline salt and an oxidizing agent and then steamin 2. Method of producing difierential color efiects comprising locally applying to a fabric containing cellulose acetate a material containing a swelling agent for the cellulose acetate, an alkali and a metallic oxalate, applying a paste containing an aniline salt and an oxidizing agent and then steaming.

3. Method of'producing differential color effects comprising locally applying to a fabric containing cellulose acetate a material comprising a swelling agent for the cellulose acetate, a vat dyestufi, an alkali and a metallic oxalate, applying a paste containin an aniline salt and an oxidizing agent, an then steaming.

4. Method of producing a differential color efiect comprising printing a fabric containing cellulose acetate yarn with a resist aste containing sodium oxalate, sodium hydroxide, a swelling agent for cellulose acetate and a vat dyestufi in reduced state, drying,

then padding onto the fabric a paste containing an aniline salt, acetic acid, sodium chlorate and copper chloride, and then steammg.

- In testimony whereof, I have hereunto subscribed my, name.

GEORGE RIVAT- 

